Acredit score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. values range from 300 to 850, with a credit score over 700 considered to be a quality credit risk. according to a survey, the mean credit score is 700.6700.6. a credit analyst wondered whether high-income individuals (incomes in excess of $100,000 per year) had higher credit scores. he obtained a random sample of 3535 high-income individuals and found the sample mean credit score to be 713.8713.8 with a standard deviation of 80.380.3. conduct the appropriate test to determine if high-income individuals have higher credit scores at the alphaαequals=0.050.05 level of significance.